question_answer

If M and N are the points whose coordinates are \[\left( \mathbf{a}{{\mathbf{p}}^{\mathbf{2}}},\text{ }\mathbf{2ap} \right)\] and \[\left( \frac{\mathbf{a}}{{{\mathbf{p}}^{\mathbf{2}}}}\mathbf{,}\frac{\mathbf{2a}}{\mathbf{p}} \right)\]  respectively and S is the point (a, 0), then \[\frac{\mathbf{1}}{\mathbf{SM}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{SN}}\] is equal to ____­­­­_____

A) a                                                                     

B) ap          

C) \[\frac{1}{a}\]          

D) \[\frac{1}{ap}\]

E)  None of these